1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "nfcommander.h"
#include "config.h"
typedef struct /*_config_section*/ {
char* name;
size_t entries;
char** keys;
char** values;
} config_section_t;
size_t nsections = 0, current_section = 0;
config_section_t* sections = NULL;
static int config_section(char* section){
size_t n = 0;
//check if section already exists
for(n = 0; n < nsections; n++){
if(!strcmp(sections[n].name, section)){
current_section = n;
return 0;
}
}
//create new section
sections = realloc(sections, (nsections + 1) * sizeof(config_section_t));
if(!sections){
nsections = 0;
printf("Failed to allocate memory\n");
return -1;
}
memset(sections + nsections, 0, sizeof(config_section_t));
sections[nsections].name = strdup(section);
if(!sections[nsections].name){
printf("Failed to allocate memory\n");
return -1;
}
current_section = nsections;
nsections++;
return 0;
}
static int config_set(char* key, char* value){
size_t n = 0;
if(!sections || !nsections){
printf("Assignment outside of section\n");
return 1;
}
//check if property already present
for(n = 0; n < sections[current_section].entries; n++){
if(!strcmp(sections[current_section].keys[n], key)){
printf("Overriding previous value of %s.%s with %s\n",
sections[current_section].name,
key, value);
free(sections[current_section].values[n]);
sections[current_section].values[n] = strdup(value);
return 0;
}
}
//add property
sections[current_section].keys = realloc(sections[current_section].keys, (sections[current_section].entries + 1) * sizeof(char*));
sections[current_section].values = realloc(sections[current_section].values, (sections[current_section].entries + 1) * sizeof(char*));
if(!sections[current_section].keys || !sections[current_section].values){
printf("Filed to allocate memory\n");
sections[current_section].entries = 0;
return 1;
}
sections[current_section].keys[sections[current_section].entries] = strdup(key);
sections[current_section].values[sections[current_section].entries] = strdup(value);
sections[current_section].entries++;
return 0;
}
static int config_handle_line(char* line){
char* next_token = NULL;
size_t len = 0;
//ignore comments
if(line[0] == ';'){
return 0;
}
//select or create section
if(line[0] == '['){
next_token = strchr(line, ']');
if(!next_token){
printf("Unterminated start of section\n");
return 1;
}
*next_token = 0;
return config_section(line + 1);
}
next_token = strchr(line, '=');
if(!next_token){
printf("Not an assignment: %s\n", line);
return 1;
}
*next_token = 0;
next_token++;
//rtrim line
len = strlen(line);
for(; len && !isgraph(line[len]); len--){
line[len] = 0;
}
//ltrim value
for(; *next_token && !isgraph(*next_token); next_token++){
}
if(len && strlen(next_token)){
return config_set(line, next_token);
}
printf("Invalid assignment\n");
return 1;
}
int config_read(char* path){
ssize_t line_len = 0;
size_t line_alloc = 0, line_number = 1;
char* line = NULL;
FILE* input = fopen(path, "r");
if(!input){
printf("Failed to open %s as configuration file\n", path);
return 1;
}
printf("Reading config file %s\n", path);
for(line_len = getline(&line, &line_alloc, input); line_len >= 0; line_len = getline(&line, &line_alloc, input)){
//right-trim
for(; line_len && !isgraph(line[line_len]); line_len--){
line[line_len] = 0;
}
if(!line_len){
continue;
}
if(config_handle_line(line)){
printf("Failed parsing %s at line %lu\n", path, line_number);
return 1;
}
line_number++;
}
free(line);
fclose(input);
return 0;
}
char* config_get(char* section, char* property){
size_t n = 0, p = 0;
//find section
for(n = 0; n < nsections; n++){
if(!strcmp(section, sections[n].name)){
break;
}
}
if(n == nsections){
printf("Requested config section %s not found\n", section);
return NULL;
}
//find key
for(p = 0; p < sections[n].entries; p++){
if(!strcmp(sections[n].keys[p], property)){
return sections[n].values[p];
}
}
printf("Requested property %s.%s not configured\n", section, property);
return NULL;
}
void config_free(){
size_t n = 0, p = 0;
for(n = 0; n < nsections; n++){
free(sections[n].name);
for(p = 0; p < sections[n].entries; p++){
free(sections[n].keys[p]);
free(sections[n].values[p]);
}
free(sections[n].keys);
free(sections[n].values);
}
free(sections);
sections = NULL;
nsections = 0;
}
|
